You can take the full Tour of the Penn Quarter Neighborhood on the Historypin site. Or if you’re in DC, download the Historypin app to your tablet or smartphone to see the photos in situ as you walk between the Walter E. Washington Convention Center toward the National Archives building and National Mall area. As you stroll down the main corridor and sidestreets of 7th Street NW, the Historypin app will use your GPS location to suggest images along the route where you can stop and view historic photographs and documents from the past, juxtaposed with modern scenery. Stops include the nation’s first telegraph office and Ford’s Theater in 1865.